[l10n] Add Brazilian Portuguese (pt-BR) locale for date pickers

[jardelnovaes]

More than 210 million people speak Brazilian Portuguese.
More than 70 million people speak European Portuguese.

Supporting pt-BR 'Out of the box' will be nice.

Closes #5099

[mui-bot]

These are the results for the performance tests:

Test case	Unit	Min	Max	Median	Mean	σ
Filter 100k rows	ms	241.2	505.8	386.4	365.62	104.247
Sort 100k rows	ms	468.7	835.5	793.2	733.74	134.148
Select 100k rows	ms	115.1	359.2	201.5	219.96	86.218
Deselect 100k rows	ms	104.6	251.4	179.7	175.36	51.249

Generated by 🚫 dangerJS against 659d283

[jardelnovaes]

@m4theushw I'm "new" here, I accepted one of yours suggestions and the "ci/circleci: test_static" failed, but I think its all right.
Maybe I need to do something, can you help me?

(I accepted right on "commit suggestion button")

[m4theushw]

You need to run yarn prettier and commit the result. I think it was formatting error caused by my suggestion.

[jardelnovaes]

@m4theushw

I was trying to understand, no changes with yarn prettier or yarn prettier check-changed or yarn prettier write-changed.

Finally it worked with yarn prettier write (it processed all files)

Thanks for your help!

[jardelnovaes]

@m4theushw

About the argos step, should I do something? Or just wait?

thanks again for your help!

[m4theushw]

Thanks!

Argos is green now.